Add API routes to lock and unlock issues (#34165)

This pull request adds a GitHub-compatible API endpoint to lock and
unlock an issue.

The following routes exist now:
- `PUT /api/v1/repos/{owner}/{repo}/issues/{id}/lock` to lock an issue
- `DELETE /api/v1/repos/{owner}/{repo}/issues/{id}/lock` to unlock an issue

Fixes #33677
Fixes #20012

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/api/v1/swagger/options.go

@@ -216,4 +216,7 @@ type swaggerParameterBodies struct {
 
 	// in:body
 	UpdateVariableOption api.UpdateVariableOption
+
+	// in:body
+	LockIssueOption api.LockIssueOption
 }